Portable workbench



FIG. 1 is a front view of the workbench, taken from slightly above the level of the workbench top;

FIG. 2 is a view of the left-hand side of the workbench, also taken from slightly above the level of the workbench top;

FIG. 3 is a perspective view taken from the rear, lefthand side of the workbench; and

FIG. 4 is a perspective view taken from the front, righthand side of the workbench. 

The ornamental design for the portable workbench, as shown. 